| 摘要 |
An advance and retreat assist tool (100) includes a base unit (300), an attachment portion (400) which attaches the base unit (300) to a treatment instrument insertion portion (35) so that the base unit (300) is rotatable around a central axis of a treatment instrument insertion hole portion (35a), a first tubular member (500) and a fixing portion (600). The advance and retreat assist tool (100) also includes a rotary portion (700) which is removably provided in the base unit (300) to adjacent to the first tubular member (500), and an advance and retreat mechanism (800). |
